Balance Shaft: Description and Operation

Typical Balance Shaft Components:

The crankshaft has been modified with the addition of a drive gear machined in the area next to the crankshaft timing disc, Fig. 16. This gear drives the combination in-sump oil pump and balance shafts.

The balancer assembly consists of two eccentrically weighted shafts and gears which are counter rotated at twice the crankshaft speed by a concentric gear. These weights on the balance shafts reduce vibration at all engine speeds.